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/* |
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* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
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* |
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* Copyright (c) 1997-2015 ircd-hybrid development team |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 |
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* USA |
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*/ |
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|
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/*! \file channel.c |
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* \brief Responsible for managing channels, members, bans and topics |
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* \version $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#include "list.h" |
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#include "channel.h" |
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#include "channel_mode.h" |
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#include "client.h" |
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#include "hash.h" |
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#include "conf.h" |
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#include "hostmask.h" |
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#include "irc_string.h" |
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#include "ircd.h" |
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#include "numeric.h" |
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#include "server.h" |
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#include "send.h" |
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#include "event.h" |
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#include "memory.h" |
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#include "mempool.h" |
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#include "misc.h" |
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#include "resv.h" |
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|
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|
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dlink_list channel_list; |
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mp_pool_t *ban_pool; /*! \todo ban_pool shouldn't be a global var */ |
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|
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struct event splitmode_event = |
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{ |
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.name = "check_splitmode", |
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.handler = check_splitmode, |
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.when = 5 |
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}; |
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|
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static mp_pool_t *member_pool, *channel_pool; |
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|
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|
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/*! \brief Initializes the channel blockheap, adds known channel CAPAB |
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*/ |
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void |
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channel_init(void) |
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{ |
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add_capability("EX", CAP_EX, 1); |
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add_capability("IE", CAP_IE, 1); |
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|
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channel_pool = mp_pool_new(sizeof(struct Channel), MP_CHUNK_SIZE_CHANNEL); |
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ban_pool = mp_pool_new(sizeof(struct Ban), MP_CHUNK_SIZE_BAN); |
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member_pool = mp_pool_new(sizeof(struct Membership), MP_CHUNK_SIZE_MEMBER); |
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} |
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|
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/*! \brief Adds a user to a channel by adding another link to the |
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* channels member chain. |
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* \param chptr Pointer to channel to add client to |
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* \param who Pointer to client (who) to add |
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* \param flags Flags for chanops etc |
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* \param flood_ctrl Whether to count this join in flood calculations |
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*/ |
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void |
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add_user_to_channel(struct Channel *chptr, struct Client *who, |
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unsigned int flags, int flood_ctrl) |
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{ |
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struct Membership *member = NULL; |
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|
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if (GlobalSetOptions.joinfloodtime > 0) |
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{ |
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if (flood_ctrl) |
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++chptr->number_joined; |
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|
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chptr->number_joined -= (CurrentTime - chptr->last_join_time) * |
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(((float)GlobalSetOptions.joinfloodcount) / |
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(float)GlobalSetOptions.joinfloodtime); |
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|
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if (chptr->number_joined <= 0) |
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{ |
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chptr->number_joined = 0; |
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ClearJoinFloodNoticed(chptr); |
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} |
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else if (chptr->number_joined >= GlobalSetOptions.joinfloodcount) |
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{ |
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chptr->number_joined = GlobalSetOptions.joinfloodcount; |
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|
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if (!IsSetJoinFloodNoticed(chptr)) |
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{ |
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SetJoinFloodNoticed(chptr); |
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sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE, |
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"Possible Join Flooder %s on %s target: %s", |
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get_client_name(who, HIDE_IP), |
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who->servptr->name, chptr->name); |
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} |
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} |
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|
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chptr->last_join_time = CurrentTime; |
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} |
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|
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member = mp_pool_get(member_pool); |
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member->client_p = who; |
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member->chptr = chptr; |
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member->flags = flags; |
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|
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dlinkAdd(member, &member->channode, &chptr->members); |
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|
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if (MyConnect(who)) |
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dlinkAdd(member, &member->locchannode, &chptr->locmembers); |
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|
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dlinkAdd(member, &member->usernode, &who->channel); |
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} |
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|
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/*! \brief Deletes an user from a channel by removing a link in the |
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* channels member chain. |
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* \param member Pointer to Membership struct |
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*/ |
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void |
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remove_user_from_channel(struct Membership *member) |
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{ |
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struct Client *const client_p = member->client_p; |
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struct Channel *const chptr = member->chptr; |
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|
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dlinkDelete(&member->channode, &chptr->members); |
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|
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if (MyConnect(client_p)) |
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dlinkDelete(&member->locchannode, &chptr->locmembers); |
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|
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dlinkDelete(&member->usernode, &client_p->channel); |
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|
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mp_pool_release(member); |
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|
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if (chptr->members.head == NULL) |
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destroy_channel(chptr); |
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} |
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|
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/* send_members() |
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* |
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* inputs - |
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* output - NONE |
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* side effects - |
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*/ |
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static void |
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send_members(struct Client *client_p, const struct Channel *chptr, |
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char *modebuf, char *parabuf) |
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{ |
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char buf[IRCD_BUFSIZE] = ""; |
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const dlink_node *node = NULL; |
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int tlen; /* length of text to append */ |
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char *t, *start; /* temp char pointer */ |
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|
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start = t = buf + snprintf(buf, sizeof(buf), ":%s SJOIN %lu %s %s %s:", |
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me.id, (unsigned long)chptr->creationtime, |
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chptr->name, modebuf, parabuf); |
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|
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DLINK_FOREACH(node, chptr->members.head) |
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{ |
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const struct Membership *member = node->data; |
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|
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tlen = strlen(member->client_p->id) + 1; /* +1 for space */ |
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|
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if (member->flags & CHFL_CHANOP) |
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++tlen; |
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if (member->flags & CHFL_HALFOP) |
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++tlen; |
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if (member->flags & CHFL_VOICE) |
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++tlen; |
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|
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/* |
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* Space will be converted into CR, but we also need space for LF.. |
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* That's why we use '- 1' here -adx |
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*/ |
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if (t + tlen - buf > IRCD_BUFSIZE - 1) |
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{ |
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*(t - 1) = '\0'; /* Kill the space and terminate the string */ |
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sendto_one(client_p, "%s", buf); |
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t = start; |
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} |
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|
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if (member->flags & CHFL_CHANOP) |
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*t++ = '@'; |
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if (member->flags & CHFL_HALFOP) |
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*t++ = '%'; |
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if (member->flags & CHFL_VOICE) |
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*t++ = '+'; |
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|
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strcpy(t, member->client_p->id); |
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|
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t += strlen(t); |
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*t++ = ' '; |
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} |
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|
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/* Should always be non-NULL unless we have a kind of persistent channels */ |
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if (chptr->members.head) |
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t--; /* Take the space out */ |
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*t = '\0'; |
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sendto_one(client_p, "%s", buf); |
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} |
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|
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/*! \brief Sends +b/+e/+I |
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* \param client_p Client pointer to server |
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* \param chptr Pointer to channel |
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* \param list Pointer to list of modes to send |
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* \param flag Char flag flagging type of mode. Currently this can be 'b', e' or 'I' |
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*/ |
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static void |
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send_mode_list(struct Client *client_p, const struct Channel *chptr, |
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const dlink_list *list, const char flag) |
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{ |
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const dlink_node *node = NULL; |
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char mbuf[IRCD_BUFSIZE] = ""; |
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char pbuf[IRCD_BUFSIZE] = ""; |
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int tlen, mlen, cur_len; |
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char *pp = pbuf; |
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|
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if (!list->length) |
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return; |
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|
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mlen = snprintf(mbuf, sizeof(mbuf), ":%s BMASK %lu %s %c :", me.id, |
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(unsigned long)chptr->creationtime, chptr->name, flag); |
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cur_len = mlen; |
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|
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DLINK_FOREACH(node, list->head) |
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{ |
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const struct Ban *ban = node->data; |
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|
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tlen = ban->len + 3; /* +3 for ! + @ + space */ |
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|
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/* |
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* Send buffer and start over if we cannot fit another ban |
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*/ |
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if (cur_len + (tlen - 1) > IRCD_BUFSIZE - 2) |
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{ |
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*(pp - 1) = '\0'; /* Get rid of trailing space on buffer */ |
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sendto_one(client_p, "%s%s", mbuf, pbuf); |
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|
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cur_len = mlen; |
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pp = pbuf; |
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} |
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|
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pp += sprintf(pp, "%s!%s@%s ", ban->name, ban->user, ban->host); |
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cur_len += tlen; |
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} |
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|
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*(pp - 1) = '\0'; /* Get rid of trailing space on buffer */ |
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sendto_one(client_p, "%s%s", mbuf, pbuf); |
263 |
} |
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|
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/*! \brief Send "client_p" a full list of the modes for channel chptr |
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* \param client_p Pointer to client client_p |
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* \param chptr Pointer to channel pointer |
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*/ |
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void |
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send_channel_modes(struct Client *client_p, struct Channel *chptr) |
271 |
{ |
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char modebuf[MODEBUFLEN] = ""; |
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char parabuf[MODEBUFLEN] = ""; |
274 |
|
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channel_modes(chptr, client_p, modebuf, parabuf); |
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send_members(client_p, chptr, modebuf, parabuf); |
277 |
|
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send_mode_list(client_p, chptr, &chptr->banlist, 'b'); |
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send_mode_list(client_p, chptr, &chptr->exceptlist, 'e'); |
280 |
send_mode_list(client_p, chptr, &chptr->invexlist, 'I'); |
281 |
} |
282 |
|
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/*! \brief Check channel name for invalid characters |
284 |
* \param name Pointer to channel name string |
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* \param local Indicates whether it's a local or remote creation |
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* \return 0 if invalid, 1 otherwise |
287 |
*/ |
288 |
int |
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check_channel_name(const char *name, const int local) |
290 |
{ |
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const char *p = name; |
292 |
|
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assert(p); |
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|
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if (!IsChanPrefix(*p)) |
296 |
return 0; |
297 |
|
298 |
if (!local || !ConfigChannel.disable_fake_channels) |
299 |
{ |
300 |
while (*++p) |
301 |
if (!IsChanChar(*p)) |
302 |
return 0; |
303 |
} |
304 |
else |
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{ |
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while (*++p) |
307 |
if (!IsVisibleChanChar(*p)) |
308 |
return 0; |
309 |
} |
310 |
|
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return p - name <= CHANNELLEN; |
312 |
} |
313 |
|
314 |
void |
315 |
remove_ban(struct Ban *ban, dlink_list *list) |
316 |
{ |
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dlinkDelete(&ban->node, list); |
318 |
|
319 |
MyFree(ban->name); |
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MyFree(ban->user); |
321 |
MyFree(ban->host); |
322 |
MyFree(ban->who); |
323 |
|
324 |
mp_pool_release(ban); |
325 |
} |
326 |
|
327 |
/* free_channel_list() |
328 |
* |
329 |
* inputs - pointer to dlink_list |
330 |
* output - NONE |
331 |
* side effects - |
332 |
*/ |
333 |
void |
334 |
free_channel_list(dlink_list *list) |
335 |
{ |
336 |
dlink_node *node = NULL, *node_next = NULL; |
337 |
|
338 |
DLINK_FOREACH_SAFE(node, node_next, list->head) |
339 |
remove_ban(node->data, list); |
340 |
|
341 |
assert(list->tail == NULL && list->head == NULL); |
342 |
} |
343 |
|
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/*! \brief Get Channel block for name (and allocate a new channel |
345 |
* block, if it didn't exist before) |
346 |
* \param name Channel name |
347 |
* \return Channel block |
348 |
*/ |
349 |
struct Channel * |
350 |
make_channel(const char *name) |
351 |
{ |
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struct Channel *chptr = NULL; |
353 |
|
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assert(!EmptyString(name)); |
355 |
|
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chptr = mp_pool_get(channel_pool); |
357 |
|
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/* Doesn't hurt to set it here */ |
359 |
chptr->creationtime = CurrentTime; |
360 |
chptr->last_join_time = CurrentTime; |
361 |
|
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strlcpy(chptr->name, name, sizeof(chptr->name)); |
363 |
dlinkAdd(chptr, &chptr->node, &channel_list); |
364 |
|
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hash_add_channel(chptr); |
366 |
|
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return chptr; |
368 |
} |
369 |
|
370 |
/*! \brief Walk through this channel, and destroy it. |
371 |
* \param chptr Channel pointer |
372 |
*/ |
373 |
void |
374 |
destroy_channel(struct Channel *chptr) |
375 |
{ |
376 |
clear_invites(chptr); |
377 |
|
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/* Free ban/exception/invex lists */ |
379 |
free_channel_list(&chptr->banlist); |
380 |
free_channel_list(&chptr->exceptlist); |
381 |
free_channel_list(&chptr->invexlist); |
382 |
|
383 |
dlinkDelete(&chptr->node, &channel_list); |
384 |
hash_del_channel(chptr); |
385 |
|
386 |
mp_pool_release(chptr); |
387 |
} |
388 |
|
389 |
/*! |
390 |
* \param chptr Pointer to channel |
391 |
* \return String pointer "=" if public, "@" if secret else "*" |
392 |
*/ |
393 |
static const char * |
394 |
channel_pub_or_secret(const struct Channel *chptr) |
395 |
{ |
396 |
if (SecretChannel(chptr)) |
397 |
return "@"; |
398 |
if (PrivateChannel(chptr)) |
399 |
return "*"; |
400 |
return "="; |
401 |
} |
402 |
|
403 |
/*! \brief lists all names on given channel |
404 |
* \param source_p Pointer to client struct requesting names |
405 |
* \param chptr Pointer to channel block |
406 |
* \param show_eon Show RPL_ENDOFNAMES numeric or not |
407 |
* (don't want it with /names with no params) |
408 |
*/ |
409 |
void |
410 |
channel_member_names(struct Client *source_p, struct Channel *chptr, |
411 |
int show_eon) |
412 |
{ |
413 |
const dlink_node *node = NULL; |
414 |
char buf[IRCD_BUFSIZE + 1] = ""; |
415 |
char *t = NULL, *start = NULL; |
416 |
int tlen = 0; |
417 |
const int is_member = IsMember(source_p, chptr); |
418 |
const int multi_prefix = HasCap(source_p, CAP_MULTI_PREFIX) != 0; |
419 |
const int uhnames = HasCap(source_p, CAP_UHNAMES) != 0; |
420 |
|
421 |
if (PubChannel(chptr) || is_member) |
422 |
{ |
423 |
t = buf + snprintf(buf, sizeof(buf), numeric_form(RPL_NAMREPLY), |
424 |
me.name, source_p->name, |
425 |
channel_pub_or_secret(chptr), chptr->name); |
426 |
start = t; |
427 |
|
428 |
DLINK_FOREACH(node, chptr->members.head) |
429 |
{ |
430 |
const struct Membership *member = node->data; |
431 |
|
432 |
if (HasUMode(member->client_p, UMODE_INVISIBLE) && !is_member) |
433 |
continue; |
434 |
|
435 |
if (!uhnames) |
436 |
tlen = strlen(member->client_p->name) + 1; /* +1 for space */ |
437 |
else |
438 |
tlen = strlen(member->client_p->name) + strlen(member->client_p->username) + |
439 |
strlen(member->client_p->host) + 3; /* +3 for ! + @ + space */ |
440 |
|
441 |
if (!multi_prefix) |
442 |
{ |
443 |
if (member->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE)) |
444 |
++tlen; |
445 |
} |
446 |
else |
447 |
{ |
448 |
if (member->flags & CHFL_CHANOP) |
449 |
++tlen; |
450 |
if (member->flags & CHFL_HALFOP) |
451 |
++tlen; |
452 |
if (member->flags & CHFL_VOICE) |
453 |
++tlen; |
454 |
} |
455 |
|
456 |
if (t + tlen - buf > IRCD_BUFSIZE - 2) |
457 |
{ |
458 |
*(t - 1) = '\0'; |
459 |
sendto_one(source_p, "%s", buf); |
460 |
t = start; |
461 |
} |
462 |
|
463 |
if (!uhnames) |
464 |
t += sprintf(t, "%s%s ", get_member_status(member, multi_prefix), |
465 |
member->client_p->name); |
466 |
else |
467 |
t += sprintf(t, "%s%s!%s@%s ", get_member_status(member, multi_prefix), |
468 |
member->client_p->name, member->client_p->username, |
469 |
member->client_p->host); |
470 |
} |
471 |
|
472 |
if (tlen) |
473 |
{ |
474 |
*(t - 1) = '\0'; |
475 |
sendto_one(source_p, "%s", buf); |
476 |
} |
477 |
} |
478 |
|
479 |
if (show_eon) |
480 |
sendto_one_numeric(source_p, &me, RPL_ENDOFNAMES, chptr->name); |
481 |
} |
482 |
|
483 |
/*! \brief Adds client to invite list |
484 |
* \param chptr Pointer to channel block |
485 |
* \param who Pointer to client to add invite to |
486 |
*/ |
487 |
void |
488 |
add_invite(struct Channel *chptr, struct Client *who) |
489 |
{ |
490 |
del_invite(chptr, who); |
491 |
|
492 |
/* |
493 |
* Delete last link in chain if the list is max length |
494 |
*/ |
495 |
if (dlink_list_length(&who->connection->invited) >= |
496 |
ConfigChannel.max_channels) |
497 |
del_invite(who->connection->invited.tail->data, who); |
498 |
|
499 |
/* Add client to channel invite list */ |
500 |
dlinkAdd(who, make_dlink_node(), &chptr->invites); |
501 |
|
502 |
/* Add channel to the end of the client invite list */ |
503 |
dlinkAdd(chptr, make_dlink_node(), &who->connection->invited); |
504 |
} |
505 |
|
506 |
/*! \brief Delete Invite block from channel invite list |
507 |
* and client invite list |
508 |
* \param chptr Pointer to Channel struct |
509 |
* \param who Pointer to client to remove invites from |
510 |
*/ |
511 |
void |
512 |
del_invite(struct Channel *chptr, struct Client *who) |
513 |
{ |
514 |
dlink_node *node = NULL; |
515 |
|
516 |
if ((node = dlinkFindDelete(&who->connection->invited, chptr))) |
517 |
free_dlink_node(node); |
518 |
|
519 |
if ((node = dlinkFindDelete(&chptr->invites, who))) |
520 |
free_dlink_node(node); |
521 |
} |
522 |
|
523 |
/*! \brief Removes all invites of a specific channel |
524 |
* \param chptr Pointer to Channel struct |
525 |
*/ |
526 |
void |
527 |
clear_invites(struct Channel *chptr) |
528 |
{ |
529 |
dlink_node *node = NULL, *node_next = NULL; |
530 |
|
531 |
DLINK_FOREACH_SAFE(node, node_next, chptr->invites.head) |
532 |
del_invite(chptr, node->data); |
533 |
} |
534 |
|
535 |
/* get_member_status() |
536 |
* |
537 |
* inputs - pointer to struct Membership |
538 |
* - YES if we can combine different flags |
539 |
* output - string either @, +, % or "" depending on whether |
540 |
* chanop, voiced or user |
541 |
* side effects - |
542 |
* |
543 |
* NOTE: Returned string is usually a static buffer |
544 |
* (like in get_client_name) |
545 |
*/ |
546 |
const char * |
547 |
get_member_status(const struct Membership *member, const int combine) |
548 |
{ |
549 |
static char buffer[4]; /* 4 for @%+\0 */ |
550 |
char *p = buffer; |
551 |
|
552 |
if (member->flags & CHFL_CHANOP) |
553 |
{ |
554 |
if (!combine) |
555 |
return "@"; |
556 |
*p++ = '@'; |
557 |
} |
558 |
|
559 |
if (member->flags & CHFL_HALFOP) |
560 |
{ |
561 |
if (!combine) |
562 |
return "%"; |
563 |
*p++ = '%'; |
564 |
} |
565 |
|
566 |
if (member->flags & CHFL_VOICE) |
567 |
*p++ = '+'; |
568 |
*p = '\0'; |
569 |
|
570 |
return buffer; |
571 |
} |
572 |
|
573 |
/*! |
574 |
* \param who Pointer to Client to check |
575 |
* \param list Pointer to ban list to search |
576 |
* \return 1 if ban found for given n!u\@h mask, 0 otherwise |
577 |
*/ |
578 |
static int |
579 |
find_bmask(const struct Client *who, const dlink_list *const list) |
580 |
{ |
581 |
const dlink_node *node = NULL; |
582 |
|
583 |
DLINK_FOREACH(node, list->head) |
584 |
{ |
585 |
const struct Ban *ban = node->data; |
586 |
|
587 |
if (!match(ban->name, who->name) && !match(ban->user, who->username)) |
588 |
{ |
589 |
switch (ban->type) |
590 |
{ |
591 |
case HM_HOST: |
592 |
if (!match(ban->host, who->host) || !match(ban->host, who->sockhost)) |
593 |
return 1; |
594 |
break; |
595 |
case HM_IPV4: |
596 |
if (who->connection->aftype == AF_INET) |
597 |
if (match_ipv4(&who->connection->ip, &ban->addr, ban->bits)) |
598 |
return 1; |
599 |
break; |
600 |
case HM_IPV6: |
601 |
if (who->connection->aftype == AF_INET6) |
602 |
if (match_ipv6(&who->connection->ip, &ban->addr, ban->bits)) |
603 |
return 1; |
604 |
break; |
605 |
default: |
606 |
assert(0); |
607 |
} |
608 |
} |
609 |
} |
610 |
|
611 |
return 0; |
612 |
} |
613 |
|
614 |
/*! |
615 |
* \param chptr Pointer to channel block |
616 |
* \param who Pointer to client to check access fo |
617 |
* \return 0 if not banned, 1 otherwise |
618 |
*/ |
619 |
int |
620 |
is_banned(const struct Channel *chptr, const struct Client *who) |
621 |
{ |
622 |
if (find_bmask(who, &chptr->banlist)) |
623 |
if (!find_bmask(who, &chptr->exceptlist)) |
624 |
return 1; |
625 |
|
626 |
return 0; |
627 |
} |
628 |
|
629 |
/*! Tests if a client can join a certain channel |
630 |
* \param source_p Pointer to client attempting to join |
631 |
* \param chptr Pointer to channel |
632 |
* \param key Key sent by client attempting to join if present |
633 |
* \return ERR_BANNEDFROMCHAN, ERR_INVITEONLYCHAN, ERR_CHANNELISFULL |
634 |
* or 0 if allowed to join. |
635 |
*/ |
636 |
int |
637 |
can_join(struct Client *source_p, const struct Channel *chptr, const char *key) |
638 |
{ |
639 |
if ((chptr->mode.mode & MODE_SSLONLY) && !HasUMode(source_p, UMODE_SSL)) |
640 |
return ERR_SSLONLYCHAN; |
641 |
|
642 |
if ((chptr->mode.mode & MODE_REGONLY) && !HasUMode(source_p, UMODE_REGISTERED)) |
643 |
return ERR_NEEDREGGEDNICK; |
644 |
|
645 |
if ((chptr->mode.mode & MODE_OPERONLY) && !HasUMode(source_p, UMODE_OPER)) |
646 |
return ERR_OPERONLYCHAN; |
647 |
|
648 |
if (chptr->mode.mode & MODE_INVITEONLY) |
649 |
if (!dlinkFind(&source_p->connection->invited, chptr)) |
650 |
if (!find_bmask(source_p, &chptr->invexlist)) |
651 |
return ERR_INVITEONLYCHAN; |
652 |
|
653 |
if (chptr->mode.key[0] && (!key || strcmp(chptr->mode.key, key))) |
654 |
return ERR_BADCHANNELKEY; |
655 |
|
656 |
if (chptr->mode.limit && dlink_list_length(&chptr->members) >= |
657 |
chptr->mode.limit) |
658 |
return ERR_CHANNELISFULL; |
659 |
|
660 |
if (is_banned(chptr, source_p)) |
661 |
return ERR_BANNEDFROMCHAN; |
662 |
|
663 |
return 0; |
664 |
} |
665 |
|
666 |
int |
667 |
has_member_flags(const struct Membership *member, const unsigned int flags) |
668 |
{ |
669 |
return member && (member->flags & flags); |
670 |
} |
671 |
|
672 |
struct Membership * |
673 |
find_channel_link(struct Client *client_p, struct Channel *chptr) |
674 |
{ |
675 |
dlink_node *node = NULL; |
676 |
|
677 |
if (!IsClient(client_p)) |
678 |
return NULL; |
679 |
|
680 |
if (dlink_list_length(&chptr->members) < dlink_list_length(&client_p->channel)) |
681 |
{ |
682 |
DLINK_FOREACH(node, chptr->members.head) |
683 |
if (((struct Membership *)node->data)->client_p == client_p) |
684 |
return node->data; |
685 |
} |
686 |
else |
687 |
{ |
688 |
DLINK_FOREACH(node, client_p->channel.head) |
689 |
if (((struct Membership *)node->data)->chptr == chptr) |
690 |
return node->data; |
691 |
} |
692 |
|
693 |
return NULL; |
694 |
} |
695 |
|
696 |
/*! Checks if a message contains control codes |
697 |
* \param message The actual message string the client wants to send |
698 |
* \return 1 if the message does contain any control codes, 0 otherwise |
699 |
*/ |
700 |
static int |
701 |
msg_has_ctrls(const char *message) |
702 |
{ |
703 |
const unsigned char *p = (const unsigned char *)message; |
704 |
|
705 |
for (; *p; ++p) |
706 |
{ |
707 |
if (*p > 31 || *p == 1) |
708 |
continue; /* No control code or CTCP */ |
709 |
|
710 |
if (*p == 27) /* Escape */ |
711 |
{ |
712 |
/* ISO 2022 charset shift sequence */ |
713 |
if (*(p + 1) == '$' || |
714 |
*(p + 1) == '(') |
715 |
{ |
716 |
++p; |
717 |
continue; |
718 |
} |
719 |
} |
720 |
|
721 |
return 1; /* Control code */ |
722 |
} |
723 |
|
724 |
return 0; /* No control code found */ |
725 |
} |
726 |
|
727 |
/*! Tests if a client can send to a channel |
728 |
* \param chptr Pointer to Channel struct |
729 |
* \param source_p Pointer to Client struct |
730 |
* \param member Pointer to Membership struct (can be NULL) |
731 |
* \param message The actual message string the client wants to send |
732 |
* \return CAN_SEND_OPV if op or voiced on channel\n |
733 |
* CAN_SEND_NONOP if can send to channel but is not an op\n |
734 |
* ERR_CANNOTSENDTOCHAN or ERR_NEEDREGGEDNICK if they cannot send to channel\n |
735 |
*/ |
736 |
int |
737 |
can_send(struct Channel *chptr, struct Client *source_p, |
738 |
struct Membership *member, const char *message) |
739 |
{ |
740 |
const struct MaskItem *conf = NULL; |
741 |
|
742 |
if (IsServer(source_p) || HasFlag(source_p, FLAGS_SERVICE)) |
743 |
return CAN_SEND_OPV; |
744 |
|
745 |
if (MyClient(source_p) && !IsExemptResv(source_p)) |
746 |
if (!(HasUMode(source_p, UMODE_OPER) && ConfigGeneral.oper_pass_resv)) |
747 |
if ((conf = match_find_resv(chptr->name)) && !resv_find_exempt(source_p, conf)) |
748 |
return ERR_CANNOTSENDTOCHAN; |
749 |
|
750 |
if ((chptr->mode.mode & MODE_NOCTRL) && msg_has_ctrls(message)) |
751 |
return ERR_NOCTRLSONCHAN; |
752 |
|
753 |
if (chptr->mode.mode & MODE_NOCTCP) |
754 |
if (*message == '\001' && strncmp(message + 1, "ACTION ", 7)) |
755 |
return ERR_NOCTCP; |
756 |
|
757 |
if (member || (member = find_channel_link(source_p, chptr))) |
758 |
if (member->flags & (CHFL_CHANOP|CHFL_HALFOP|CHFL_VOICE)) |
759 |
return CAN_SEND_OPV; |
760 |
|
761 |
if (!member && (chptr->mode.mode & MODE_NOPRIVMSGS)) |
762 |
return ERR_CANNOTSENDTOCHAN; |
763 |
|
764 |
if (chptr->mode.mode & MODE_MODERATED) |
765 |
return ERR_CANNOTSENDTOCHAN; |
766 |
|
767 |
if ((chptr->mode.mode & MODE_MODREG) && !HasUMode(source_p, UMODE_REGISTERED)) |
768 |
return ERR_NEEDREGGEDNICK; |
769 |
|
770 |
/* Cache can send if banned */ |
771 |
if (MyClient(source_p)) |
772 |
{ |
773 |
if (member) |
774 |
{ |
775 |
if (member->flags & CHFL_BAN_SILENCED) |
776 |
return ERR_CANNOTSENDTOCHAN; |
777 |
|
778 |
if (!(member->flags & CHFL_BAN_CHECKED)) |
779 |
{ |
780 |
if (is_banned(chptr, source_p)) |
781 |
{ |
782 |
member->flags |= (CHFL_BAN_CHECKED|CHFL_BAN_SILENCED); |
783 |
return ERR_CANNOTSENDTOCHAN; |
784 |
} |
785 |
|
786 |
member->flags |= CHFL_BAN_CHECKED; |
787 |
} |
788 |
} |
789 |
else if (is_banned(chptr, source_p)) |
790 |
return ERR_CANNOTSENDTOCHAN; |
791 |
} |
792 |
|
793 |
return CAN_SEND_NONOP; |
794 |
} |
795 |
|
796 |
/*! \brief Updates the client's oper_warn_count_down, warns the |
797 |
* IRC operators if necessary, and updates |
798 |
* join_leave_countdown as needed. |
799 |
* \param source_p Pointer to struct Client to check |
800 |
* \param name Channel name or NULL if this is a part. |
801 |
*/ |
802 |
void |
803 |
check_spambot_warning(struct Client *source_p, const char *name) |
804 |
{ |
805 |
int t_delta = 0; |
806 |
int decrement_count = 0; |
807 |
|
808 |
if ((GlobalSetOptions.spam_num && |
809 |
(source_p->connection->join_leave_count >= |
810 |
GlobalSetOptions.spam_num))) |
811 |
{ |
812 |
if (source_p->connection->oper_warn_count_down > 0) |
813 |
source_p->connection->oper_warn_count_down--; |
814 |
else |
815 |
source_p->connection->oper_warn_count_down = 0; |
816 |
|
817 |
if (source_p->connection->oper_warn_count_down == 0) |
818 |
{ |
819 |
/* It's already known as a possible spambot */ |
820 |
if (name) |
821 |
sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE, |
822 |
"User %s (%s@%s) trying to join %s is a possible spambot", |
823 |
source_p->name, source_p->username, |
824 |
source_p->host, name); |
825 |
else |
826 |
sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE, |
827 |
"User %s (%s@%s) is a possible spambot", |
828 |
source_p->name, source_p->username, |
829 |
source_p->host); |
830 |
source_p->connection->oper_warn_count_down = OPER_SPAM_COUNTDOWN; |
831 |
} |
832 |
} |
833 |
else |
834 |
{ |
835 |
if ((t_delta = (CurrentTime - source_p->connection->last_leave_time)) > |
836 |
JOIN_LEAVE_COUNT_EXPIRE_TIME) |
837 |
{ |
838 |
decrement_count = (t_delta / JOIN_LEAVE_COUNT_EXPIRE_TIME); |
839 |
|
840 |
if (decrement_count > source_p->connection->join_leave_count) |
841 |
source_p->connection->join_leave_count = 0; |
842 |
else |
843 |
source_p->connection->join_leave_count -= decrement_count; |
844 |
} |
845 |
else |
846 |
{ |
847 |
if ((CurrentTime - (source_p->connection->last_join_time)) < |
848 |
GlobalSetOptions.spam_time) |
849 |
source_p->connection->join_leave_count++; /* It's a possible spambot */ |
850 |
} |
851 |
|
852 |
if (name) |
853 |
source_p->connection->last_join_time = CurrentTime; |
854 |
else |
855 |
source_p->connection->last_leave_time = CurrentTime; |
856 |
} |
857 |
} |
858 |
|
859 |
/*! \brief Compares usercount and servercount against their split |
860 |
* values and adjusts splitmode accordingly |
861 |
* \param unused Unused address pointer |
862 |
*/ |
863 |
void |
864 |
check_splitmode(void *unused) |
865 |
{ |
866 |
if (splitchecking && (ConfigChannel.no_join_on_split || |
867 |
ConfigChannel.no_create_on_split)) |
868 |
{ |
869 |
const unsigned int server = dlink_list_length(&global_server_list); |
870 |
|
871 |
if (!splitmode && ((server < split_servers) || (Count.total < split_users))) |
872 |
{ |
873 |
splitmode = 1; |
874 |
|
875 |
sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE, |
876 |
"Network split, activating splitmode"); |
877 |
event_add(&splitmode_event, NULL); |
878 |
} |
879 |
else if (splitmode && (server >= split_servers) && (Count.total >= split_users)) |
880 |
{ |
881 |
splitmode = 0; |
882 |
|
883 |
sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE, |
884 |
"Network rejoined, deactivating splitmode"); |
885 |
event_delete(&splitmode_event); |
886 |
} |
887 |
} |
888 |
} |
889 |
|
890 |
/*! \brief Sets the channel topic for a certain channel |
891 |
* \param chptr Pointer to struct Channel |
892 |
* \param topic The topic string |
893 |
* \param topic_info n!u\@h formatted string of the topic setter |
894 |
* \param topicts Timestamp on the topic |
895 |
* \param local Whether the topic is set by a local client |
896 |
*/ |
897 |
void |
898 |
channel_set_topic(struct Channel *chptr, const char *topic, |
899 |
const char *topic_info, time_t topicts, int local) |
900 |
{ |
901 |
if (local) |
902 |
strlcpy(chptr->topic, topic, IRCD_MIN(sizeof(chptr->topic), ConfigServerInfo.max_topic_length + 1)); |
903 |
else |
904 |
strlcpy(chptr->topic, topic, sizeof(chptr->topic)); |
905 |
|
906 |
strlcpy(chptr->topic_info, topic_info, sizeof(chptr->topic_info)); |
907 |
chptr->topic_time = topicts; |
908 |
} |
909 |
|
910 |
/* do_join_0() |
911 |
* |
912 |
* inputs - pointer to client doing join 0 |
913 |
* output - NONE |
914 |
* side effects - Use has decided to join 0. This is legacy |
915 |
* from the days when channels were numbers not names. *sigh* |
916 |
* There is a bunch of evilness necessary here due to |
917 |
* anti spambot code. |
918 |
*/ |
919 |
void |
920 |
channel_do_join_0(struct Client *source_p) |
921 |
{ |
922 |
dlink_node *node = NULL, *node_next = NULL; |
923 |
|
924 |
if (source_p->channel.head) |
925 |
if (MyConnect(source_p) && !HasUMode(source_p, UMODE_OPER)) |
926 |
check_spambot_warning(source_p, NULL); |
927 |
|
928 |
DLINK_FOREACH_SAFE(node, node_next, source_p->channel.head) |
929 |
{ |
930 |
struct Channel *chptr = ((struct Membership *)node->data)->chptr; |
931 |
|
932 |
sendto_server(source_p, 0, 0, ":%s PART %s", |
933 |
source_p->id, chptr->name); |
934 |
sendto_channel_local(0, chptr, ":%s!%s@%s PART %s", |
935 |
source_p->name, source_p->username, |
936 |
source_p->host, chptr->name); |
937 |
|
938 |
remove_user_from_channel(node->data); |
939 |
} |
940 |
} |
941 |
|
942 |
static char * |
943 |
channel_find_last0(struct Client *source_p, char *chanlist) |
944 |
{ |
945 |
int join0 = 0; |
946 |
|
947 |
for (char *p = chanlist; *p; ++p) /* Find last "JOIN 0" */ |
948 |
{ |
949 |
if (*p == '0' && (*(p + 1) == ',' || *(p + 1) == '\0')) |
950 |
{ |
951 |
if (*(p + 1) == ',') |
952 |
++p; |
953 |
|
954 |
chanlist = p + 1; |
955 |
join0 = 1; |
956 |
} |
957 |
else |
958 |
{ |
959 |
while (*p != ',' && *p != '\0') /* Skip past channel name */ |
960 |
++p; |
961 |
|
962 |
if (*p == '\0') /* Hit the end */ |
963 |
break; |
964 |
} |
965 |
} |
966 |
|
967 |
if (join0) |
968 |
channel_do_join_0(source_p); |
969 |
|
970 |
return chanlist; |
971 |
} |
972 |
|
973 |
void |
974 |
channel_do_join(struct Client *source_p, char *channel, char *key_list) |
975 |
{ |
976 |
char *p = NULL; |
977 |
char *chan = NULL; |
978 |
char *chan_list = NULL; |
979 |
struct Channel *chptr = NULL; |
980 |
struct MaskItem *conf = NULL; |
981 |
const struct ClassItem *const class = get_class_ptr(&source_p->connection->confs); |
982 |
int i = 0; |
983 |
unsigned int flags = 0; |
984 |
|
985 |
chan_list = channel_find_last0(source_p, channel); |
986 |
|
987 |
for (chan = strtoken(&p, chan_list, ","); chan; |
988 |
chan = strtoken(&p, NULL, ",")) |
989 |
{ |
990 |
const char *key = NULL; |
991 |
|
992 |
/* If we have any more keys, take the first for this channel. */ |
993 |
if (!EmptyString(key_list) && (key_list = strchr(key = key_list, ','))) |
994 |
*key_list++ = '\0'; |
995 |
|
996 |
/* Empty keys are the same as no keys. */ |
997 |
if (key && *key == '\0') |
998 |
key = NULL; |
999 |
|
1000 |
if (!check_channel_name(chan, 1)) |
1001 |
{ |
1002 |
sendto_one_numeric(source_p, &me, ERR_BADCHANNAME, chan); |
1003 |
continue; |
1004 |
} |
1005 |
|
1006 |
if (!IsExemptResv(source_p) && |
1007 |
!(HasUMode(source_p, UMODE_OPER) && ConfigGeneral.oper_pass_resv) && |
1008 |
((conf = match_find_resv(chan)) && !resv_find_exempt(source_p, conf))) |
1009 |
{ |
1010 |
++conf->count; |
1011 |
sendto_one_numeric(source_p, &me, ERR_CHANBANREASON, |
1012 |
chan, conf->reason ? conf->reason : "Reserved channel"); |
1013 |
sendto_realops_flags(UMODE_REJ, L_ALL, SEND_NOTICE, |
1014 |
"Forbidding reserved channel %s from user %s", |
1015 |
chan, get_client_name(source_p, HIDE_IP)); |
1016 |
continue; |
1017 |
} |
1018 |
|
1019 |
if (dlink_list_length(&source_p->channel) >= |
1020 |
((class->max_channels) ? class->max_channels : ConfigChannel.max_channels)) |
1021 |
{ |
1022 |
sendto_one_numeric(source_p, &me, ERR_TOOMANYCHANNELS, chan); |
1023 |
break; |
1024 |
} |
1025 |
|
1026 |
if ((chptr = hash_find_channel(chan))) |
1027 |
{ |
1028 |
if (IsMember(source_p, chptr)) |
1029 |
continue; |
1030 |
|
1031 |
if (splitmode && !HasUMode(source_p, UMODE_OPER) && |
1032 |
ConfigChannel.no_join_on_split) |
1033 |
{ |
1034 |
sendto_one_numeric(source_p, &me, ERR_UNAVAILRESOURCE, chptr->name); |
1035 |
continue; |
1036 |
} |
1037 |
|
1038 |
/* |
1039 |
* can_join checks for +i key, bans. |
1040 |
*/ |
1041 |
if ((i = can_join(source_p, chptr, key))) |
1042 |
{ |
1043 |
sendto_one_numeric(source_p, &me, i, chptr->name); |
1044 |
continue; |
1045 |
} |
1046 |
|
1047 |
/* |
1048 |
* This should never be the case unless there is some sort of |
1049 |
* persistant channels. |
1050 |
*/ |
1051 |
if (!dlink_list_length(&chptr->members)) |
1052 |
flags = CHFL_CHANOP; |
1053 |
else |
1054 |
flags = 0; |
1055 |
} |
1056 |
else |
1057 |
{ |
1058 |
if (splitmode && !HasUMode(source_p, UMODE_OPER) && |
1059 |
(ConfigChannel.no_create_on_split || ConfigChannel.no_join_on_split)) |
1060 |
{ |
1061 |
sendto_one_numeric(source_p, &me, ERR_UNAVAILRESOURCE, chan); |
1062 |
continue; |
1063 |
} |
1064 |
|
1065 |
flags = CHFL_CHANOP; |
1066 |
chptr = make_channel(chan); |
1067 |
} |
1068 |
|
1069 |
if (!HasUMode(source_p, UMODE_OPER)) |
1070 |
check_spambot_warning(source_p, chptr->name); |
1071 |
|
1072 |
add_user_to_channel(chptr, source_p, flags, 1); |
1073 |
|
1074 |
/* |
1075 |
* Set timestamp if appropriate, and propagate |
1076 |
*/ |
1077 |
if (flags == CHFL_CHANOP) |
1078 |
{ |
1079 |
chptr->creationtime = CurrentTime; |
1080 |
chptr->mode.mode |= MODE_TOPICLIMIT; |
1081 |
chptr->mode.mode |= MODE_NOPRIVMSGS; |
1082 |
|
1083 |
sendto_server(source_p, 0, 0, ":%s SJOIN %lu %s +nt :@%s", |
1084 |
me.id, (unsigned long)chptr->creationtime, |
1085 |
chptr->name, source_p->id); |
1086 |
|
1087 |
/* |
1088 |
* Notify all other users on the new channel |
1089 |
*/ |
1090 |
sendto_channel_local_butone(NULL, CAP_EXTENDED_JOIN, 0, chptr, ":%s!%s@%s JOIN %s %s :%s", |
1091 |
source_p->name, source_p->username, |
1092 |
source_p->host, chptr->name, |
1093 |
(!IsDigit(source_p->account[0]) && source_p->account[0] != '*') ? source_p->account : "*", |
1094 |
source_p->info); |
1095 |
sendto_channel_local_butone(NULL, 0, CAP_EXTENDED_JOIN, chptr, ":%s!%s@%s JOIN :%s", |
1096 |
source_p->name, source_p->username, |
1097 |
source_p->host, chptr->name); |
1098 |
sendto_channel_local(0, chptr, ":%s MODE %s +nt", |
1099 |
me.name, chptr->name); |
1100 |
|
1101 |
if (source_p->away[0]) |
1102 |
sendto_channel_local_butone(source_p, CAP_AWAY_NOTIFY, 0, chptr, |
1103 |
":%s!%s@%s AWAY :%s", |
1104 |
source_p->name, source_p->username, |
1105 |
source_p->host, source_p->away); |
1106 |
} |
1107 |
else |
1108 |
{ |
1109 |
sendto_server(source_p, 0, 0, ":%s JOIN %lu %s +", |
1110 |
source_p->id, (unsigned long)chptr->creationtime, |
1111 |
chptr->name); |
1112 |
|
1113 |
sendto_channel_local_butone(NULL, CAP_EXTENDED_JOIN, 0, chptr, ":%s!%s@%s JOIN %s %s :%s", |
1114 |
source_p->name, source_p->username, |
1115 |
source_p->host, chptr->name, |
1116 |
(!IsDigit(source_p->account[0]) && source_p->account[0] != '*') ? source_p->account : "*", |
1117 |
source_p->info); |
1118 |
sendto_channel_local_butone(NULL, 0, CAP_EXTENDED_JOIN, chptr, ":%s!%s@%s JOIN :%s", |
1119 |
source_p->name, source_p->username, |
1120 |
source_p->host, chptr->name); |
1121 |
|
1122 |
if (source_p->away[0]) |
1123 |
sendto_channel_local_butone(source_p, CAP_AWAY_NOTIFY, 0, chptr, |
1124 |
":%s!%s@%s AWAY :%s", |
1125 |
source_p->name, source_p->username, |
1126 |
source_p->host, source_p->away); |
1127 |
} |
1128 |
|
1129 |
del_invite(chptr, source_p); |
1130 |
|
1131 |
if (chptr->topic[0]) |
1132 |
{ |
1133 |
sendto_one_numeric(source_p, &me, RPL_TOPIC, chptr->name, chptr->topic); |
1134 |
sendto_one_numeric(source_p, &me, RPL_TOPICWHOTIME, chptr->name, |
1135 |
chptr->topic_info, chptr->topic_time); |
1136 |
} |
1137 |
|
1138 |
channel_member_names(source_p, chptr, 1); |
1139 |
|
1140 |
source_p->connection->last_join_time = CurrentTime; |
1141 |
} |
1142 |
} |
1143 |
|
1144 |
/*! \brief Removes a client from a specific channel |
1145 |
* \param source_p Pointer to source client to remove |
1146 |
* \param name Name of channel to remove from |
1147 |
* \param reason Part reason to show |
1148 |
*/ |
1149 |
static void |
1150 |
channel_part_one_client(struct Client *source_p, const char *name, const char *reason) |
1151 |
{ |
1152 |
struct Channel *chptr = NULL; |
1153 |
struct Membership *member = NULL; |
1154 |
|
1155 |
if ((chptr = hash_find_channel(name)) == NULL) |
1156 |
{ |
1157 |
sendto_one_numeric(source_p, &me, ERR_NOSUCHCHANNEL, name); |
1158 |
return; |
1159 |
} |
1160 |
|
1161 |
if ((member = find_channel_link(source_p, chptr)) == NULL) |
1162 |
{ |
1163 |
sendto_one_numeric(source_p, &me, ERR_NOTONCHANNEL, chptr->name); |
1164 |
return; |
1165 |
} |
1166 |
|
1167 |
if (MyConnect(source_p) && !HasUMode(source_p, UMODE_OPER)) |
1168 |
check_spambot_warning(source_p, NULL); |
1169 |
|
1170 |
/* |
1171 |
* Remove user from the old channel (if any) |
1172 |
* only allow /part reasons in -m chans |
1173 |
*/ |
1174 |
if (*reason && (!MyConnect(source_p) || |
1175 |
((can_send(chptr, source_p, member, reason) && |
1176 |
(source_p->connection->firsttime + ConfigGeneral.anti_spam_exit_message_time) |
1177 |
< CurrentTime)))) |
1178 |
{ |
1179 |
sendto_server(source_p, 0, 0, ":%s PART %s :%s", |
1180 |
source_p->id, chptr->name, reason); |
1181 |
sendto_channel_local(0, chptr, ":%s!%s@%s PART %s :%s", |
1182 |
source_p->name, source_p->username, |
1183 |
source_p->host, chptr->name, reason); |
1184 |
} |
1185 |
else |
1186 |
{ |
1187 |
sendto_server(source_p, 0, 0, ":%s PART %s", |
1188 |
source_p->id, chptr->name); |
1189 |
sendto_channel_local(0, chptr, ":%s!%s@%s PART %s", |
1190 |
source_p->name, source_p->username, |
1191 |
source_p->host, chptr->name); |
1192 |
} |
1193 |
|
1194 |
remove_user_from_channel(member); |
1195 |
} |
1196 |
|
1197 |
void |
1198 |
channel_do_part(struct Client *source_p, char *channel, const char *reason) |
1199 |
{ |
1200 |
char *p = NULL, *name = NULL; |
1201 |
char buf[KICKLEN + 1] = ""; |
1202 |
|
1203 |
if (!EmptyString(reason)) |
1204 |
strlcpy(buf, reason, sizeof(buf)); |
1205 |
|
1206 |
for (name = strtoken(&p, channel, ","); name; |
1207 |
name = strtoken(&p, NULL, ",")) |
1208 |
channel_part_one_client(source_p, name, buf); |
1209 |
} |